A 20ga is .690 at the base, close to 600NE at .699.
16ga is .740 at base. 577NE is .662 at base.
So if 16ga shell went into chamber is must be bigger than
577NE and 600NE.Sounds as if you have a rare bird there.
You need a chamber cast. May be worth a mint.Ed.

Did it look anything like this?

Maybe it was a 16bore slug gun.
Does your father still have it?

A friend had an old German single-shot, bolt action, with octagonal barrel and incredibly deep rifling. He said it was some sort of 16-gauge ball rifle as well.

No, he haven't it. I am just interested what it was.

I will see with my father on weekend so I will show him that picture.

Thank you all for help.

Jiri

When my father was a boy, he found old single shot underlevel rifle, I belive falling block system. It was rifle, not shotgun in any case but there was no ammo for that. They discovered that 16 gauge shells fit the chamber and could be fired.

I know it is not many informations but what caliber it could be or what rifle. I belive they told me he seen that rifle in some old document from "wild west".

Any opinions ?

Jiri

Jiri
It sounds like it simply is a 16 gauge ball shot rifle.

Martin

577 2 3/4?

SLUG THE BORE

jeffe

577 is a 24 guage.

urdubob

I also think that it was .577 and told father it was not 16, but 24 or 28 gauge, but he is sure it was 16 gauge . . .

But I don't know there was rifles in 16 gauge (with full length barrel rifling) . . .

It is just for interest.

Jiri

Bob,
indeed, the 577 itseld is not a 16 ga... but the CHAMBER may be close enough to put a 16 ga in...


slug the barrel!!

jeffe